Question

How can I continue an audio playback in iPhone when it auto-locks or the user locks the phone?

I already tried

session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayback error:NULL];

but that doesn’t seem to work.

Answer 1

I finally figured out how to do this!

First of all, include these frameworks to your project: AudioToolbox, CoreAudio, MediaPlayer and AVFoundation. Import them all to the viewController where your player will be placed. After you allocated and started playing the audio, insert the following code:

UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback;
AudioSessionSetProperty (kAudioSessionProperty_AudioCategory, sizeof (sessionCategory), &sessionCategory);
AudioSessionSetActive(true);

And finally, go to your app Info.plist file and add a row named UIBackgroundModes. The new row will be an array and will contain 1 item, the item 0. To this you just set the value as audio. And you’re done! Enjoy you’re background audio playing app!